Question

The equation for the circle below is x2 + y2 = 121. What is the length of the circle's radius?

Answer 1

11 ...........................................

Answer 2

The radius of the given circle is 11 units.

Explanation:

The equation of circle is x²+y²=121

This is standard form of equation.

`(x-h)^2+(y-k)^2=r^2`

where, r is radius of circle and (h,k) is center of circle.

If we compare the standard form of equation to given equation

`r^2=121`

Now, we solve for r

Taking square root both sides

`r=√(121)`

`r=11`

Hence, The radius of the given circle is 11 units.